Posted by KEB1 on November 03, 2009 at 21:08:51 from (97.124.142.73):
In Reply to: Wiring size question posted by Mike CA on November 03, 2009 at 20:49:53:
Mike,
There's nothing magical about any of the wire sizes. Any bigger size will always work, until you get to the point that its too big to fit on the connectors. A lot of times something smaller will work just as well.
12 volt lights draw less current than 6 volt ones, for the same brightness. However, 12 volt lights tend to be brighter (higher wattage) offsetting some of this difference.
For the ignition and field wiring, it only needs to carry a few amps, and just about anything sturdy enough to survive the vibration will work. I wouldn't go much small than about 18 guage just because it would be too easy to damage.
The wiring from the output of the generator to the battery has to be able to carry the output of the generator without overheating. For runs this short, the resistance of the wire itself can be reasonably ignored (resistance here will slightly affect how fast the battery charges, but won't keep in from charging completely). I probably wouldn't go much smaller than #12 for a 20 or 30 amp generator, although #14 would probably be OK for a temporary installtion.
Wiring to the lights should be a reasonable size, as extra resistance here will affect how bright the lights are. Again, for a temporary installation, just about anything of reasonable size would work, particularly if you're not concerned about how bright the lights are.
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